8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579

General

Target

8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579.exe
Size

287KB
MD5

75afa6f084a7a481aa258f2d55ca020f
SHA1

c784e128d7db0c3b262a77e6c0978889e7bc43a3
SHA256

8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579
SHA512

f3f0071247765f45c688cbf11f6ded910b3dcfe9334cd3468ade2baecd2adec4f3413db159dc9033a81974aab7b2de676cbbde11cfc918371d2ae7e54d538f74
SSDEEP

6144:QchRJa3/4YIJ8m1MxUyRzoVOBlYQflIGS:QchKP4BJTM6++OBlYERS

Score

8^/10

aspackv2 persistence upx

Malware Config

Signatures

ASPack v2.12-2.42 6 IoCs

Detects executables packed with ASPack v2.12-2.42

aspackv2

Processes:

resource	yara_rule
C:\4fcf5b4d.exe	aspack_v212_v242
C:\4fcf5b4d.exe	aspack_v212_v242
\??\c:\windows\SysWOW64\fastuserswitchingcompatibility.dll	aspack_v212_v242
C:\Windows\SysWOW64\FastUserSwitchingCompatibility.dll	aspack_v212_v242
\??\c:\windows\SysWOW64\irmon.dll	aspack_v212_v242
C:\Windows\SysWOW64\Irmon.dll	aspack_v212_v242

Executes dropped EXE 1 IoCs

Processes:

4fcf5b4d.exe

pid process

888 4fcf5b4d.exe

pid	process
888	4fcf5b4d.exe

Sets DLL path for service in the registry 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

4fcf5b4d.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\FastUserSwitchingCompatibility\Parameters\ServiceDll = "C:\\Windows\\system32\\FastUserSwitchingCompatibility.dll"	4fcf5b4d.exe
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Ias\Parameters\ServiceDll = "C:\\Windows\\system32\\Ias.dll"	4fcf5b4d.exe
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Irmon\Parameters\ServiceDll = "C:\\Windows\\system32\\Irmon.dll"	4fcf5b4d.exe
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Nla\Parameters\ServiceDll = "C:\\Windows\\system32\\Nla.dll"	4fcf5b4d.exe

UPX packed file 16 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral2/memory/3356-132-0x0000000000400000-0x000000000045D000-memory.dmp	upx
C:\4fcf5b4d.exe	upx
C:\4fcf5b4d.exe	upx
behavioral2/memory/888-136-0x00000000006F0000-0x000000000073E000-memory.dmp	upx
behavioral2/memory/888-137-0x00000000006F0000-0x000000000073E000-memory.dmp	upx
behavioral2/memory/888-138-0x00000000006F0000-0x000000000073E000-memory.dmp	upx
\??\c:\windows\SysWOW64\fastuserswitchingcompatibility.dll	upx
C:\Windows\SysWOW64\FastUserSwitchingCompatibility.dll	upx
behavioral2/memory/1308-144-0x0000000075690000-0x00000000756DE000-memory.dmp	upx
behavioral2/memory/1308-143-0x0000000075690000-0x00000000756DE000-memory.dmp	upx
behavioral2/memory/1308-145-0x0000000075690000-0x00000000756DE000-memory.dmp	upx
behavioral2/memory/888-146-0x00000000006F0000-0x000000000073E000-memory.dmp	upx
\??\c:\windows\SysWOW64\irmon.dll	upx
C:\Windows\SysWOW64\Irmon.dll	upx
behavioral2/memory/808-150-0x00000000750E0000-0x000000007512E000-memory.dmp	upx
behavioral2/memory/808-149-0x00000000750E0000-0x000000007512E000-memory.dmp	upx

Loads dropped DLL 2 IoCs

Processes:

svchost.exesvchost.exe

pid process

1308 svchost.exe
808 svchost.exe

pid	process
1308	svchost.exe
808	svchost.exe

Drops file in System32 directory 4 IoCs

Processes:

4fcf5b4d.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\FastUserSwitchingCompatibility.dll	4fcf5b4d.exe
File opened for modification	C:\Windows\SysWOW64\Ias.dll	4fcf5b4d.exe
File opened for modification	C:\Windows\SysWOW64\Irmon.dll	4fcf5b4d.exe
File opened for modification	C:\Windows\SysWOW64\Nla.dll	4fcf5b4d.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

4fcf5b4d.exe

pid process

888 4fcf5b4d.exe
888 4fcf5b4d.exe

pid	process
888	4fcf5b4d.exe
888	4fcf5b4d.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579.exe

description	pid	process	target process
PID 3356 wrote to memory of 888	3356	8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579.exe	4fcf5b4d.exe
PID 3356 wrote to memory of 888	3356	8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579.exe	4fcf5b4d.exe
PID 3356 wrote to memory of 888	3356	8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579.exe	4fcf5b4d.exe

C:\Users\Admin\AppData\Local\Temp\8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579.exe
"C:\Users\Admin\AppData\Local\Temp\8261570cb1dfe89d1988281cb1acc085e5a10d8ea09fa61e3db8b177a8de8579.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3356

C:\4fcf5b4d.exe
C:\4fcf5b4d.exe
2⤵
- Executes dropped EXE
- Sets DLL path for service in the registry
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
PID:888

C:\Windows\SysWOW64\svchost.exe
C:\Windows\SysWOW64\svchost.exe -k netsvcs -s FastUserSwitchingCompatibility
1⤵
- Loads dropped DLL
PID:1308

C:\Windows\SysWOW64\svchost.exe
C:\Windows\SysWOW64\svchost.exe -k netsvcs -s Irmon
1⤵
- Loads dropped DLL
PID:808

C:\Windows\SysWOW64\svchost.exe
C:\Windows\SysWOW64\svchost.exe -k netsvcs -s Nla
1⤵
PID:2136

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\4fcf5b4d.exe
Filesize
240KB

MD5
f5d2a6e81cd9b23d4899371b296b8a8c

SHA1
7b095e73b522c5a1b12e26ae389464c5c123bc8e

SHA256
775082343ef68119bf9bf671c677c981b68ed6f627ff5b8b4de414e2e9d29a42

SHA512
77842aae633daac864c148fdc5d40b22cc1dc9e3e0c0e81df7694d2c6e95bfb02bc18bb34c047bbf4b12dc24d14eb1b89acf75f43f547e311fe63730b6a54662

Download Submit
C:\4fcf5b4d.exe
Filesize
240KB

MD5
f5d2a6e81cd9b23d4899371b296b8a8c

SHA1
7b095e73b522c5a1b12e26ae389464c5c123bc8e

SHA256
775082343ef68119bf9bf671c677c981b68ed6f627ff5b8b4de414e2e9d29a42

SHA512
77842aae633daac864c148fdc5d40b22cc1dc9e3e0c0e81df7694d2c6e95bfb02bc18bb34c047bbf4b12dc24d14eb1b89acf75f43f547e311fe63730b6a54662

Download Submit
C:\Windows\SysWOW64\FastUserSwitchingCompatibility.dll
Filesize
240KB

MD5
e48f830a89ba95daf7650bb9b05bd117

SHA1
304e6666ad4a8e0329f7aa4646c34c5fe57d19fe

SHA256
046338af97e20aaf13aa5aa3c550a139a5f41ee3f22592497ab1f9b7c82786c6

SHA512
a462bea2fedd9135dd9b226b5b20cfd8172581d03b2c06acae4018ba8fba1c1e5f2d68f7e0ff860fd9269a02e36cc6c59e33b8c02f8168cd83e674ee074b3095

Download Submit
C:\Windows\SysWOW64\Irmon.dll
Filesize
240KB

MD5
e48f830a89ba95daf7650bb9b05bd117

SHA1
304e6666ad4a8e0329f7aa4646c34c5fe57d19fe

SHA256
046338af97e20aaf13aa5aa3c550a139a5f41ee3f22592497ab1f9b7c82786c6

SHA512
a462bea2fedd9135dd9b226b5b20cfd8172581d03b2c06acae4018ba8fba1c1e5f2d68f7e0ff860fd9269a02e36cc6c59e33b8c02f8168cd83e674ee074b3095

Download Submit
\??\c:\windows\SysWOW64\fastuserswitchingcompatibility.dll
Filesize
240KB

MD5
e48f830a89ba95daf7650bb9b05bd117

SHA1
304e6666ad4a8e0329f7aa4646c34c5fe57d19fe

SHA256
046338af97e20aaf13aa5aa3c550a139a5f41ee3f22592497ab1f9b7c82786c6

SHA512
a462bea2fedd9135dd9b226b5b20cfd8172581d03b2c06acae4018ba8fba1c1e5f2d68f7e0ff860fd9269a02e36cc6c59e33b8c02f8168cd83e674ee074b3095

Download Submit
\??\c:\windows\SysWOW64\irmon.dll
Filesize
240KB

MD5
e48f830a89ba95daf7650bb9b05bd117

SHA1
304e6666ad4a8e0329f7aa4646c34c5fe57d19fe

SHA256
046338af97e20aaf13aa5aa3c550a139a5f41ee3f22592497ab1f9b7c82786c6

SHA512
a462bea2fedd9135dd9b226b5b20cfd8172581d03b2c06acae4018ba8fba1c1e5f2d68f7e0ff860fd9269a02e36cc6c59e33b8c02f8168cd83e674ee074b3095

Download Submit
memory/808-151-0x00000000750E0000-0x000000007512E000-memory.dmp

Filesize
312KB

Download
memory/808-149-0x00000000750E0000-0x000000007512E000-memory.dmp

Filesize
312KB

Download
memory/808-150-0x00000000750E0000-0x000000007512E000-memory.dmp

Filesize
312KB

Download
memory/888-133-0x0000000000000000-mapping.dmp

Download
memory/888-139-0x0000000002930000-0x0000000006930000-memory.dmp

Filesize
64.0MB

Download
memory/888-140-0x0000000002930000-0x0000000006930000-memory.dmp

Filesize
64.0MB

Download
memory/888-137-0x00000000006F0000-0x000000000073E000-memory.dmp

Filesize
312KB

Download
memory/888-136-0x00000000006F0000-0x000000000073E000-memory.dmp

Filesize
312KB

Download
memory/888-138-0x00000000006F0000-0x000000000073E000-memory.dmp

Filesize
312KB

Download
memory/888-146-0x00000000006F0000-0x000000000073E000-memory.dmp

Filesize
312KB

Download
memory/1308-143-0x0000000075690000-0x00000000756DE000-memory.dmp

Filesize
312KB

Download
memory/1308-145-0x0000000075690000-0x00000000756DE000-memory.dmp

Filesize
312KB

Download
memory/1308-144-0x0000000075690000-0x00000000756DE000-memory.dmp

Filesize
312KB

Download
memory/3356-132-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads